I don't know what everyone is using, but here's what I do.
I use an iPad, and have a Mac. I use EN's program Skitch to take photos of items I want to insert into an EN. Then I edit that photo in Skitch to crop it down to only what I need. Then I just copy/paste that Skitch photo into an EN note (or you could simply "move" the note to the notebook of your choice via the desktop app). Skitch stores your photos in a special EN book, if you allow it to, so you're really not creating a lot of additional work for yourself, and you don't need to take extra steps to get the photo into your EN app.
Now, that all being said, I'm not sure if the resolution the iPad takes is lesser than however else these photos are being taken. I also have never seen an option to set resolution of the photos the iPad takes - but they are not DSL quality, so it cannot be large.
I am not sure EN should offer this feature of resizing, etc. when they already have an app that edits (to a certain extent) and utilizes the EN app - and if you want anything more powerful than that, there are plenty of apps out there to do so. EN isn't an image-centric app, it is an app to keep you organized.
(Side note: Unless things have changed since the last time I was on a Window's OS unit, simply 'dragging the corners' doesn't reduce the size of the original image file, but it does affect how it appears in the document. In other words, the link is still to a large file, so it still has to access the large file before it sizes it. It may appear small, but it still takes up the same amount of file space. I don't think this is the best way to reduce file size. )